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Persist timers TCPTV_PERSMIN and TCPTV_PERSMAX are hardcoded with 5 seconds and

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60 seconds, respectively. Turn them into sysctls that can be tuned live. The
default values of 5 seconds and 60 seconds have been retained.

Submitted by:		Jason Wolfe (j at nitrology dot com)
Reviewed by:		gnn, rrs, hiren, bz
MFC after:		1 week
Sponsored by:		Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D5024
This commit is contained in:
Hiren Panchasara 2016-01-26 16:33:38 +00:00
parent fe68f570d4
commit 0645c6049d
4 changed files with 14 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/netinet/tcp_output.c
View File

@ -1626,7 +1626,7 @@ tcp_setpersist(struct tcpcb *tp)
* Start/restart persistance timer.
*/
TCPT_RANGESET(tt, t * tcp_backoff[tp->t_rxtshift],
TCPTV_PERSMIN, TCPTV_PERSMAX);
tcp_persmin, tcp_persmax);
tcp_timer_activate(tp, TT_PERSIST, tt);
if (tp->t_rxtshift < TCP_MAXRXTSHIFT)
tp->t_rxtshift++;

2
sys/netinet/tcp_subr.c
View File

@ -675,6 +675,8 @@ tcp_init(void)
tcp_rexmit_min = TCPTV_MIN;
if (tcp_rexmit_min < 1)
tcp_rexmit_min = 1;
tcp_persmin = TCPTV_PERSMIN;
tcp_persmax = TCPTV_PERSMAX;
tcp_rexmit_slop = TCPTV_CPU_VAR;
tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
tcp_tcbhashsize = hashsize;

8
sys/netinet/tcp_timer.c
View File

@ -77,6 +77,14 @@ __FBSDID("$FreeBSD$");
#include <netinet/tcp_debug.h>
#endif
int tcp_persmin;
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmin, CTLTYPE_INT|CTLFLAG_RW,
&tcp_persmin, 0, sysctl_msec_to_ticks, "I", "minimum persistence interval");
int tcp_persmax;
SYSCTL_PROC(_net_inet_tcp, OID_AUTO, persmax, CTLTYPE_INT|CTLFLAG_RW,
&tcp_persmax, 0, sysctl_msec_to_ticks, "I", "maximum persistence interval");
int tcp_keepinit;
SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit, CTLTYPE_INT|CTLFLAG_RW,
&tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "time to establish connection");

4
sys/netinet/tcp_timer.h
View File

@ -77,7 +77,7 @@
if 0, no idea yet */
#define TCPTV_RTOBASE ( 3*hz) /* assumed RTO if no info */
#define TCPTV_PERSMIN ( 5*hz) /* retransmit persistence */
#define TCPTV_PERSMIN ( 5*hz) /* minimum persist interval */
#define TCPTV_PERSMAX ( 60*hz) /* maximum persist interval */
#define TCPTV_KEEP_INIT ( 75*hz) /* initial connect keepalive */
@ -173,6 +173,8 @@ struct tcp_timer {
#define TP_KEEPCNT(tp) ((tp)->t_keepcnt ? (tp)->t_keepcnt : tcp_keepcnt)
#define TP_MAXIDLE(tp) (TP_KEEPCNT(tp) * TP_KEEPINTVL(tp))
extern int tcp_persmin; /* minimum persist interval */
extern int tcp_persmax; /* maximum persist interval */
extern int tcp_keepinit; /* time to establish connection */
extern int tcp_keepidle; /* time before keepalive probes begin */
extern int tcp_keepintvl; /* time between keepalive probes */